To provide a method capable of quickly correcting jet a stream from a weft insertion nozzle responding to the state of the weft in flight, and a device.

The weft insertion method which controls the jet stream from the weft insertion nozzle by generating a command signal on an opening grade to a throttle valve linked to the weft insertion nozzle according to the set jet-patterns, detects the arrival timing of the weft in flight according to a signal detecting the weft from a weft sensor, and corrects the opening command signal according to a deviation of the detected arrival timing to a standard timing.